Improvement in joiners clamps



lW. H. GOODCHILD 8L S. F. HAY.

Jbines Clamps.'

Patented Feb. 25,1873.

To all whom it may concern:

PATENT QEEICE OF BROOKLYN, NEW YORK, ASSIGI wiIiLIAivIl H. eooDoHILD, 0E BAYONNE, NEW JERSEY', AND sAiiIUEL E.'HAY L Nous'ro WILLIAM n. GooDcHILD, oE BAYONNE'NEW JEEsEY. f1

IMPROVEMENT" lN JOINERS CLAMPS.

Specification forming'part of Letters Patent No. 136,152, dated February 25,1373. g

Be it known thatwe, WILLIAM H. kCroon!V CHILD, 'of Bayonne, Hudsoncounty, in the l State of New'Jersey, and SAMUEL F. HAY, of

Brooklyn, Kings county, State of New York,

haveinvented certain new and useful Improvements inJciners Clamps, reference being had to the accompanying drawing and tothe letters of reference marked thereon.

-Th'e object of our invention is to render more" perfect the devices long in common use for drawing firmly together the parts of doors, vsashesyand other articles of Wood in the pro- `cess o'- manufacture, Our improved clamp is fcomposed' of two' principal parts-f-viz., a compoundjhead-block exerting. pressure on the work by `means of a lscrew and a compound tail-block, which is capable of being setv at a greater ori lessdistance from the head-blockboth working in connection with a long bar, which -we' willidesignate a ,clamp-stick. In single-faced joiners clamps pressure' is exert- "ed against the'workat oney side of the joint or mortise, and the jointis' not closed perfect` ly-its full length.'` In'y our' invention a pair of self-adjusting shoes or bearing-surfaces bear directly at each side of the mortise, and inclose a joint its full width in any description of panel or framed work. The arms are adjustable through the notched plate to vari. ous widths atwill, and are'also selfadjusting by means of the notched plate partially turning on a stout pivot, thus allowing the bearin gsurfaces or shoes a firm bearing on skewed or slightly beveled or inclined work. The arms may admit an adjustment of from four to twelve or fourteen Ainches between the shoes or bearing-surfaces. Any square work, the shoulders of whichmay have been tenoned or cut out of square, by mismanagement of machinery or other cause, is brought up and clampedrmly the entire width of the j oint. So also may any work be clamped perfectly when formed on a rake,7 orwhere the outside stileswof work are narrow and liable to twist or bulge, thus tending to open a portion of the joint. l

We will proceed to describe what we consider the best means of .carrying ont the in-= vention.

Figure l is a longitudinal section. Fig. 2 isa plan view; Fig. 3, a side view of Vmain casting of the tail-block without the plate or arms; Fig. 4, cross-sectionv of Fig. 3-with the additionl of theclamp-stick; Fig. 5, across- .section of the'head-block with' its clamps'crew and attachments.

Similar letters of reference indicate like parts in all the gures. f

A, clamp-stick ;V B, head or capcasting; C, main screw; D,travelingnut;` C", handle; IVI, arms ,J J, bearing-surfaces or vshoes on PI I; E, rocking bearing-plate;- e, spring, F, main casting of tail-block, G, locking-pin andholding device. i l

The drawing represents the novel ,parts with so' much of the clamp-stickas is necessa ryv to show their relation thereto.

, The cap-castingfB'sQof theformfshowmand held to the stickA-by screws c, and 1locked theretoby means of the'cross-ridge B ',1 which is let into a corresponding recess formed in the wood, and defends the entire head-block against any end movement The screw O'has a suitable bearing in the front of the casting B, the upper face of which is slotted, as shown. The screw C, being turned by means of the handle C', imparts a backward .or Aforward mot-ion tothe rocking plate E and its "attachments. This screw is 4preferably left-handed. v The inside collar, here shown as made separate, may be forged on the screw, and the forms and arrangement of the operatin g-handle may vary, as will be obvious.

The traveling-nut D is elongated at its front and may be braced, as dotted in Fig. 1. From the elongated portion there is ari upward extension or stud, d, of `sufficient size to fill the slot in the casting B, thus steadying the parts. Said stud, being pierced by the largen headed bolt fm, the head of which is larger than the width of the slot, and by the lower end of said bolt being slightly riveted to the 'nut D,.as shown, serves to hold up and guide the nut and screw with 'the entire parts depending thereon. The plate E rocks on the center pin or stud d of the nut D, vand allows the arms I I to adjust themselves to bearnfairly on slightly'irregular or untrue surfaces. This self-adjusting motion of the plate E and arms I I provides what I term an independent yet concerted'backwa-rd and forward movement ofthe arms, and consequently of the bearing-surfaces or shoes J J. The front of the plate E is formed with teeth or with recesses, into which correspondingly-shaped projections I z'. t from the arms I I engage,`asshown. It will be noticed that this plate E has cast on its upper surface, toward its back end, a pin or projection, E2, which stands in the slot in casting B, and by making which of a proper size the rocking motion of the plate E may be limited, thus confining the backward and forward independent movement of the armsy I I and their shoes J J within convenient limits. It will also be noticcdthat this plate E has two slots near its back end, the object of' whichis to permit the pins i i', extending downward from the back end of the arms I I,

'tov pass through them. The spring e secured' to the plate E maintains pressure on' these pins "t", and bythis means the projections t' i -which bears against the front of nut 1),.thus

relieving the stud d from much strain and zwear. The front of the nut D is rounded, to

'allow the correspondingly-formed projection El to turn smoothly thereon. The bearingplates or shoes J J form important features of our clamp. They are each a single casting, J, so shaped that a continual bearing is had against the curved end of the arms I I, thus relieving the bolt which connects them. These plates are shaped so as to take hold of the work readily, do not compel any unusual `lengthening of the stiles of the work acted upon, and are not in the way of the joiners hammer in driving wedges, &c. It will be noticed that these plates will always present a true face to the work being acted upon, no matter at what distance apart the arms I I are set, or what angle they may assume in clamping work out of square or ou a rake. The tailblock F is held to the stick A by means of the pin G which passes throughthe rings ff of the tail-block, and stands in one of a series of holes bored through said stick, as shown. The pin G and locking means are shown clearly'in. section in Fig. 3. A secure and strong connection of the working parts in the tail-block to the main casting may be made by a construction similar to that of the corresponding parts in the head-block, or it may be effected by means of the stout bolt n. The arms II and face-plates J J operate with the spring e and plate E the same as in the headblock; the main casting F of the tail-block being slotted for the pin or projection E2 from the upper surface of plate E to pass through and form a stop, as explained in describing the head-block. The plate E in the tail-block diiers from plate E in clamp-screw only as to the thickness of some portions of it' shown in -section in Fig. 1; but its operation with the arms I I is'essentially the same. `Any desired length can be given to the clamp-stick.

We claim as our invention- 1. The within-described compound clamp, having adjustable vand self-adjusting arms II, with swiveling bearing surfaces or shoes J J adapted to act on each side of a joint or mortise, in combination with compressing means C, when the arms and their connections are capable of rocking to allow for inequalities or rake in the material acted upon, substantially as and for the purpose described. j

2. The spring e, arranged as shown, and serving, in combination with the armsI I and suitable engaging notches or stops, 'toallo'w of adjustment of the arms, as herein specified.

In testimony whereof we have hereunto set our hands this 16th day of November, 1872,v

in the presence of two subscribing witnesses.

WILLIAM H. GOODOHILD. SAMUEL F. HAY.

Witnesses:

WM. C. DEY, ALF. WEsrBnooK. 

